<template>
	<view>
		<!-- 搜索区 -->
		<my-search @click="gotoSearch"></my-search>
		<!-- 滑动区 -->
		<view class="scroll-view-container">
			<!-- 左侧滑动区 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
				<block v-for="(item,index) in cateList" :key="item.cat_id">
					<view :class="['left-scroll-view-item',index===active?'active':'']" @click="activeChange(index)">
						{{item.cat_name}}
					</view>
				</block>

			</scroll-view>
			<!-- 右侧滑动区 -->
			<scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="item2.cat_id">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">
						{{item2.cat_name}}
					</view>
					<!-- 三级分类列表 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,index) in item2.children" :key="item3.cat_id" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon.replace('dev','web')"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from "@/mixins/tabbar-badge.js"
	export default {
		mixins: [badgeMix],
		data() {
			return {
				//当前设备可用高度
				wh: 0,
				//列表数据
				cateList: [],
				active: 0,
				//二级分类
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {
					data
				} = await uni.$http.get("/api/public/v1/categories")
				if (data.meta.status === 200) {
					//赋值一级分类
					this.cateList = data.message
					//赋值二级分类
					this.cateLevel2 = data.message[0].children
				} else {
					return uni.$showMsg()
				}
			},
			activeChange(index) {
				this.active = index
				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[index].children
				//重置高度
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url: "../../subpkg/search/search"
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;
		}

		.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;

			&.active {
				background-color: #FFFFFF;
				position: relative;

				&::before {
					content: "";
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}

			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
		background-color: #f8f8f8;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>
